** Machine1 being able to see Machine2 but not the other way around usually indicates - in the absence of firewall issues, etc - that the two machines are in different subnets. That will happen if you have multiple routers or misconfigured access points.

** It's possible that snow-white has a key to a different hansel. Maybe you reinstalled hansel or maybe changed its host name which would make the key you have on snow-white no longer valid or maybe you have two hansels. But I would think your error message would be different.

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